<template>
  <!-- echarts -->
  <div>
    <div class="myChart" ref="chartRef">
    </div>
  </div>
</template>

<script>
import * as echarts from "echarts";
export default {
  //父传子
  props: {
    chartData: Object,
  },
  methods: {
    //画折线图
    renderLine(obj) {
      //默认值
      let defaultOptions = {
        title: "默认标题",
      };
      //最终参数 传入参数合并默认值
      let finalObj = { ...defaultOptions, ...obj };

      // 基于准备好的dom，初始化echarts实例
      let myChart = echarts.init(this.$refs.chartRef);
      //配置项
      let options = {
        title: {
          text: finalObj.title,
          left: 15,
          top: 15,
        },
        tooltip: {
          trigger: "axis",
        },
        legend: {
          top: 15,
        },
        grid: {
          left: "3%",
          right: "4%",
          bottom: "3%",
          containLabel: true,
        },
        toolbox: {
          feature: {
            saveAsImage: {},
          },
        },
        xAxis: {
          type: "category",
          boundaryGap: false,
          data: finalObj.xData,
        },
        yAxis: {
          type: "value",
        },
        //核心数据
        series: finalObj.series,
      };
      // 绘制图表
      myChart.setOption(options);
    },
  },
  //方式2 监听数据变化才渲染
  watch: {
    //监听父传子数据变化 再渲染
    chartData() {
      this.renderLine(this.chartData);
    },
  },
  mounted() {},
};
</script>

<style lang="scss" scoped>
.page-order {
  height: 100%;
  background: #f0f2f5;
}

.myChart {
  margin-top: 50px;
  height: 300px;
  background: white;
}
</style>